Scared how my bf will be with a newborn..

Honestly he’s so short tempered. Can hardly handle our 6 year old just talking, period. He makes here-and-there comments about how he won’t be able to stand a baby crying and how he’ll have to “shove a sock in it’s mouth” or “build a closet to put it in so it can cry” and yes, our baby is still just “it” to him. I’m regretting everything, this wasn’t planned. Now he has me scared. I’m already scared about having another baby as it is, and pretty alone. Just a rant I guess :/